packages/uswds-core/src/js/utils/is-in-viewport.js
// https://stackoverflow.com/a/7557433
function isElementInViewport(
el,
win = window,
docEl = document.documentElement
) {
const rect = el.getBoundingClientRect();
return (
rect.top >= 0 &&
rect.left >= 0 &&
rect.bottom <= (win.innerHeight || docEl.clientHeight) &&
rect.right <= (win.innerWidth || docEl.clientWidth)
);
}
module.exports = isElementInViewport;